Estimate your Section 179 first-year depreciation deduction on business equipment and property for the 2025 tax year.
2025 Section 179 limit: $1,220,000. Phase-out begins at $3,050,000 in total purchases. Consult a tax professional for your specific situation.
Section 179 of the Internal Revenue Code allows businesses to deduct the full purchase price of qualifying equipment and property in the year it is placed in service, rather than spreading the cost over several years through standard depreciation. This can significantly reduce your taxable income in the year of purchase and improve your business cash flow.
This free Section 179 depreciation deduction calculator helps you estimate your eligible deduction, your tax savings, and your effective after-tax asset cost. It accounts for business-use percentage, the 2025 deduction limit, the phase-out threshold, and your tax rate to give you a clear picture of the financial benefit before you buy.
Business owners evaluating major purchases may also find our equipment finance vs lease decision calculator useful for comparing the full cost of buying versus leasing before making a commitment.
The Section 179 deduction is calculated as the lesser of three values: the business-use eligible cost of the asset, the annual deduction limit set by the IRS, and your taxable business income. Any amount that exceeds these limits can be carried forward to future tax years or depreciated through the standard MACRS schedule.
According to IRS Publication 946, the 2025 Section 179 deduction limit is $1,220,000. The phase-out begins when total property placed in service during the year exceeds $3,050,000. For every dollar above that threshold, the maximum deduction is reduced by one dollar. Tax savings equal the deduction multiplied by your applicable tax rate. Eligible cost equals total asset cost multiplied by the business-use percentage.
A sole proprietor buys manufacturing equipment for $80,000 and uses it 100% for business. Their taxable business income is $200,000 and their tax rate is 22%. The full $80,000 qualifies under the 2025 limit. Tax savings: $80,000 x 22% equals $17,600. Effective after-tax cost: $80,000 minus $17,600 equals $62,400.
Section 179 is widely used by small and mid-size businesses buying machinery, vehicles, computers, office equipment, and certain software. It is also available for qualified improvement property — renovations to the interior of non-residential commercial buildings such as HVAC, roofing, fire protection, and security systems.
Self-employed business owners can pair this tool with our self-employment tax calculator and our qualified business income deduction calculator to see the combined tax impact of major asset purchases in any given year.
A trucking company owner purchases a new semi-truck for $120,000 and uses it entirely for business. With a 25% combined federal and state tax rate and $300,000 in business income, the Section 179 deduction reduces taxable income by the full $120,000 — saving $30,000 in taxes and reducing the effective cost of the truck to $90,000 in the first year alone.
Not all property qualifies for Section 179. Real estate and structural components of buildings generally do not qualify. Qualified assets include tangible personal property used in business, off-the-shelf software, and qualified improvement property. Check IRS Publication 946 or consult your accountant to confirm eligibility before planning around this deduction.
If your business buys multiple assets in a single year, the phase-out threshold applies to the combined total — not each asset individually. If you plan large equipment purchases throughout a year, track the running total to know when the $3,050,000 phase-out begins reducing your available deduction amount.
If the IRS audits your Section 179 claim, they will want documentation supporting the business-use percentage you claimed. Keep mileage logs for vehicles, usage records for computers and equipment, and any other supporting materials that show how and when the asset was used for legitimate business purposes.
The IRS has set the 2025 Section 179 deduction limit at $1,220,000. The phase-out begins when total assets placed in service during the year exceed $3,050,000.
Yes, but special limits apply to passenger vehicles under the luxury auto rules. Heavier SUVs, trucks, and vans used more than 50% for business may qualify for larger deductions. The annual luxury auto caps are set separately by the IRS and change each year.
Section 179 is subject to an income restriction and an annual dollar limit. Bonus depreciation has no income restriction and allows a percentage of cost to be deducted immediately. For 2025, bonus depreciation is 40% for most assets. They can often be combined strategically for maximum benefit in a given year.
No. Section 179 is limited to your taxable business income for the year. It cannot push your tax return into a net loss. Any excess deduction that cannot be used in the current year is carried forward to future tax years automatically.
Generally no for land and building structures. However, qualified improvement property — certain improvements made to the interior of a non-residential commercial building — does qualify. This includes HVAC, roofing, fire protection, and alarm systems in eligible scenarios.
Yes. Sole proprietors, partnerships, S-corporations, and C-corporations can all use Section 179, provided the asset is used in a trade or business and the income limits are satisfied for the year of purchase.
It is a type of accelerated depreciation — it allows the full cost to be deducted in year one rather than spread across the asset's useful life under the standard MACRS schedule. It is a special election under the tax code, not the default depreciation method applied automatically.
Section 179 is usually better if you have sufficient business income and want to maximize current-year tax savings. MACRS may be preferable if your income is low this year and you expect higher income in future years. A CPA can model both scenarios to find the best outcome for your situation.
Section 179 is one of the most powerful immediate tax deductions available to US business owners. By expensing the full cost of qualifying assets in the year of purchase, you can dramatically reduce your tax bill and keep more cash in your business.
Use this free calculator to estimate your deduction, tax savings, and effective after-tax asset cost before making a buying decision. For additional tax planning, explore our R&D tax credit eligibility estimator and our corporate tax rate change impact calculator.